The SCTA method implies to control the te
mperature in such a way that the reaction
rate changes with the
time according to a function previously defined by the user. Constant
Rate Thermal Analysis (CRTA) is one of
the...
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The SCTA method implies to control the te
mperature in such a way that the reaction
rate changes with the
time according to a function previously defined by the user. Constant
Rate Thermal Analysis (CRTA) is one of
the most commonly used SCTA methods and
implies achieving a temperature profile at whic
h the reaction rate remains constant all over
the process at a value previously selected by
the user. This method permits to minimize the
influence of heat and mass transfer phenomena
on the forward reaction. The scope of this
work is to develop a universal CRTA temperat
ure controller that could be adapted to any
thermoanalytical device. The thermoanalytical signal is programmed to follow a preset linear
trend by means of a conventiona
l controller that at
the time controls
a second conventional
temperature programmer that forces the temp
erature to change for achieving the trend
programmed for the thermoanalytical signal. Ex
amples of the performa
nce of this control
system with a Thermobalance and a Thermomechanical Analyser (TMA) are given.
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